Topic summaryVinyl single Expand Summary Extracted from the Wikipedia article Phonograph record. Standard formats^1⁄3 and 78.26 rpm records, and 0.504 in (12.8 mm) ˜±0.002 in (0.051 mm) for 45 rpm records.^1⁄3 rpm vinyl singles in 1949, but they were dropped in early 1950 due to the popularity of the RCA Victor 45. Wikipedia source